Buying a pair of catridges usually cost much more than buying a printer
which come with a pair of catridges(one BW and one COLOR).
If I were you, I wouldn't bother buying catridges.
Instead, I will just buy several pinters when they
are on promo(for example:boxing day sale).
If the catridge is out, throw the printer away!
Sounds ridiculous, but that is the way it works.